Sijie Guo created BOOKKEEPER-461:
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Summary: Delivery throughput degrades when there are lots of
publishers w/ high traffic.
Key: BOOKKEEPER-461
URL: https://issues.apache.org/jira/browse/BOOKKEEPER-461
Project: Bookkeeper
Issue Type: Bug
Reporter: Sijie Guo
Assignee: Sijie Guo
Fix For: 4.2.0
When running benchmarking over the hub server, found that delivery throughput
degrades when there are lots of publishers publishing messages. And the
delivery throughput will goes up when there is no publishes.
This issue is introduced due to ReadAheadCache only runs a single thread. So
when the netty workers are busy handling publish requests, they are pushing
lots of messages into ReadAheadCache's queue to put them in to read ahead
cache. So the readahead cache is busy on updating keys.
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